/* get device path */
private static string GetPath(IntPtr hInfoSet,
ref Native.DeviceInterfaceData iface)
{
/* detailed interface information */
var detIface = new Native.DeviceInterfaceDetailData();
/* required size */
uint reqSize = (uint)Marshal.SizeOf(detIface);
/* set size. The cbSize member always contains the size of the
* fixed part of the data structure, not a size reflecting the
* variable-length string at the end. */
/* now stay with me and look at that x64/x86 maddness! */
detIface.Size = Marshal.SizeOf(typeof(IntPtr)) == 8 ? 8 : 5;
/* get device path */
bool status = Native.SetupDiGetDeviceInterfaceDetail(hInfoSet,
ref iface, ref detIface, reqSize, ref reqSize, IntPtr.Zero);
/* whops */
if (!status) {
/* fail! */
throw new Win32Exception();
}
/* return device path */
return detIface.DevicePath;
}
